A lot of people are criticizing the play on the basis of, "Yeah but, if you DO tackle him the worst that can happen is 15 yards, if you don't the worst that can happen is a touchdown. Duh!"
I disagree with this. I literally have never seen a play quite like this with that result. Ever. So I would bet any amount of money that Corey's mindset, instead of the above, was "Yeah but, if you DO tackle him the worst that can happen is 15 yards, if you don't the worst that can happen is you make contact and his body momentum carries him out of bounds like it does 999 times out of 1,000."
That's an easily understandable decision to me.